STEP 5 Operations S5-100U
8.3 System Operations, for CPU 103 and Higher
System operations and supplementary operations have the following limitations:
• You can program them only in function blocks.
• You can program them only in the STL method of representation.
Since system operations access system data, only users with system knowledge should use them.
If you want to program system operations, you must select “SYS: OPS. Y” in the programmer
presets menu.
8.3.1 Set Operations
Like the supplementary bit operations, these set operations can change individual bits. Table 8-27
provides an overview of the set operations.
Table 8-27. Overview of Set Operations
Operation MeaningOperand
SU Set bit unconditionally
A specific bit is set to “1” in the system data area.
RU Reset bit unconditionally
A specific bit is set to “0” in the system data area.
Parameter
0.0 to 255.15
ID
RS
Processing Set Operations
Execution of set operations does not depend on the RLO.
8.3.2 Load and Transfer Operations
Use these load and transfer operations to address the entire program memory of the programmable
controller. They are used mainly for data exchange between the accumulator and memory locations
that cannot be addressed by operands. Table 8-28 provides an overview of the load and transfer
operations.
8-64
EWA 4NEB 812 6120-02
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